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First, write out the problem:
x+2y=4
then you have to simplify it so that only y is on one side
x+2y=4
-4 -4
x+2y-4=0
-2y -2y
x-4=-2y / -2 = -1/2x + 2 = y
then, draw out a graph:
and, let's say, x=4, then you plug that into the equation, and solve for y
in this case, if x=4, then y=0, so one of the points would be (4, 0)
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